Packing for pistons.



. No. 807,470. PATENTED DEC. 19, 1905.

W. J. KANE.

PACKING FOR PISTONS.

APYLIGATION FILED APlLll, 1904.

d twcoow UNITED STATES PATENT OFFICE.

WILLIAM JAMES KANE, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE HALF TOTHOMAS UPPERMAN, OF BALTIMORE, MARYLAND.

PACKING FOR PISTONS.

Specification of Letters Patent.

Patented Dec. 1T5, 1905.

ally adjust itself to the piston, thereby pre-' venting steam passingbetween the piston and the packing, and thereby avoiding all the ob.

' jections incidental to such passage of steam behind the packing-rings.

With this object in view my invention consists in the novel features ofconstruction and arrangements, all of which will be fully describedhereinafter, and pointed out in the claims.

In the drawings forming a part of this specification, Figure 1 is aperspective view showing a piston provided with my improved packing.Fig. 2 is a sectional view of the same. Fig. 3 is a section on the line3 3 of Fig. 2, and Fig. 4 is a section on the line 4 4 of Fig. 2.

Referring to the drawings, A indicates the piston, and B the piston-rod.Two annular recesses C are produced in the cylindrical surface of thepiston, the inner walls C of said recesses being inclined in oppositedirections, as shown, while the-outer walls C are perpendicular to thelongitudinal axis of the piston. The ends of the piston are turned off,as shown at C the purpose of which will be explained hereinafter.

D D indicate the double-flanged rings, which fit upon the end of thecylinder and carry the rings E, said rings D and E being made insections, the joints being arranged to alternate, and in practice Iprefer to divide the sections upon oblique lines. The rings D and E areunited by means of dowel-pins F in order to prevent the said ringsturning upon each other. The outer face of the ring B is turned to fitagainst the straight wall O and the rings D and E are turned after beingfitted to the piston, so as to be slightly larger in diameter than thecylinder. The space G between the ends of the piston and the ring Dserves to catch the steam for the purpose of expanding the rings andmaking a tight joint between the said rings and the cylinder, therebyutilizing the entire force of the steam, as none of it is permitted toescape between the packing-rings and cylinder.

In order to hold the face of the ring D against the face C of thepiston, and thereby prevent steam getting in back of the ring, I employa ring H between each pair of rings D and E and the inclined walls C,said ring H having an inclined face H, which engages the inclined wallC, and a straight face I-I which engages the straight faces of the ringsD and E. The ring H is normally in. such condition that its tendency isto spring or spread outwardly, and in doing so its incline face willride against the inclined wall and force the flat face of the ring Dagainst the fiat wall of the piston, thereby preventing the steamworking in behind the rings D and E, and the very moment there is anyslack between the ring D and piston the automatic outward movement ofthe wedge-shape ring will serve to bind the ring D tightly against thewall 0 of the piston.

It will thus be seen that I provide a simple and efficient constructionof piston-packing which will completely avoid steam passing between thepiston and packing-rings.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination with a piston having a circumferential groove, saidgroove having a wall perpendicular to the axis of the piston and a wallinclined outwardly and toward the first wall, a ring fitting in saidgroove, a packing-ring, a dowel-pin connecting the two rings, saidpacking-ring having its inner face parallel to the perpendicular wall ofthe groove, and a metal ring having aface adapted to bear on the innerwall of the packingring and a face adapted to bear on the inclined faceof the groove, as and for the purpose set forth.

2. The combination with the piston having an annular recess,'the innerwall being oblique and the outer wall perpendicular to the axis of thepiston, the packing-rings surrounding the piston, the outer one of whichengages the perpendicular walls of the recess, and the wedge-shaped ringhaving an oblique face adapted to engage the oblique wall of the annularrecess, the straight face of said ring being adapted to engage thepackingrings, as set forth.

WM. JAMES KANE.

Witnesses:

CHAS. B. BLAKE, HENRY S. BLAKE.

